Four-Hour Fire Resistance Rating

A Four-Hour Fire Resistance Rating indicates that a building component, such as a wall or door, can withstand exposure to fire for at least four hours without failing or allowing the fire to spread. This rating is determined through standardized testing that measures structural integrity, insulation, and resistance to heat transfer during a fire. It helps ensure safety by providing a measurable level of fire protection, giving occupants more time to evacuate and firefighters more time to respond. Essentially, it signifies a high level of fire resistance suitable for critical safety applications in buildings.